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REVENUE - net sales from customers (Details) - USD ($)
12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Revenues $ 16,702,558 $ 18,729,994
Customer A [Member] | Sales Revenue, Net [Member]    
Revenues $ 5,332,515 $ 5,462,718
Concentration Risk, Percentage 32.00% 29.00%
Customer B [Member] | Sales Revenue, Net [Member]    
Revenues $ 3,223,967 [1]
Concentration Risk, Percentage 19.00% [1]
Customer C [Member] | Sales Revenue, Net [Member]    
Revenues $ 3,196,625 $ 4,978,432
Concentration Risk, Percentage 19.00% 27.00%
[1] Less than 10% of total